.button {
	border-style: solid; 
	border-color: black; 
	margin: 5px; 
	padding: 3px; 
	background-color: lightskyblue; 
	text-align: center; 
	vertical-align: middle;
	display: block;
	width: 250px;
	cursor: pointer;
	cursor: hand;
}

.invisible {
	display: none;
}

.result {
	border-style: solid; 
	border-color: black; 
	margin: 5px; 
	padding: 3px; 
	background-color: aliceblue; 
	display: block;
}
